Cub Cadet MTD 70 Series - Manual (Page 113)

Crankshaft, piston and connecting rod
107
Piston Inspection
1. Clean the piston and remove all carbon from the rings
and ring groves.
2. Clean the cylinder bore and remove all carbon.
3. Insert one ring into the cylinder. Push it down about
one inch from the top. See Figure 10.9.
4. Measure the end gap with a feeler gauge and com-
pare to the chart at the end of this chapter.
5. Repeat steps 3 and 4 on the other rings.
NOTE: Piston rings are not available as service parts. If
any of the end gaps are out of spec, the engine
must be short blocked.
6. Install the rings on the piston.
NOTE: Typically there is a top and bottom profile to com-
pression rings, But the compression rings on the
MTD are symmetrical. See Figure 10.10.
7. Measure the distance between the ring and the ring
land using a feeler gauge and compare the measure-
ment to the chart at the end of this chapter. See Fig-
ure 10.11.
Figure 10.9
Feeler gauge
Piston ring
Figure 10.10
Top piston ring
Middle piston ring
3-piece oil ring
Figure 10.11
Feeler gauge